Well, I might have the "redneck" solution, but this is what I did. My large dog could get under those little pleated curtains...so one time
I piled luggage bags, etc. onto the front seats to keep him out....but it seemed that the inside of the rv was diminished.
(Had looked at the PC shades....wow...did not know they weren't private at night...so glad I did not get them.)
Anyhow....after getting an idea from someone at a car upholstery shop, I bought some curtain liner fabroc (at JoAnn's)...sort of rubberized..or feels like it...waterproof....anyhow it is used to line curtains that might cover a sliding glass door...so no light gets through and it blocks heat.
My sister-in-law gets the credit for cutting and stitching them for me. Wonderful!!!
There is one for each front door....the shape matches the door...but a bit wider to get "caught" in the door. The top has a short piece
stitched to the bigger piece. This shorter piece fits over the open door and laps over on the outside of the door when the door
is closed. The longer side is on the inside. The dog cannot get under it. This helps with sun/heat, privacy, and now Max cannot
see out to bark---and I can use the front seats and dash when parked.
This might have been confusing. Sorry. It was inexpensive and is not permanent; I just put them on the doors when camping. It works!